Maharashtra State Electricity Distribution Co. Ltd — Overcharged fixed charges

The fixed charges (Sthir aakaar) in each bill is Rs 30/-. However in my current bill it has been charged as Rs 330/- . All other residents in my building have been correctly charged as Rs 30/- only. Why has this mistake been committed only in my case? Will the bill be corrected before i make my payment? Why should I unnecessarily pay Rs 300/- extra for a mistake made by you? I have always been regular in payment of my electricity bills. Please solve my problem. I am a resident of Bldg 10/11, Vijay Annex, Ghodbunder Rd, Thane-W.